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√Δ=14
x₁=(2-14)/2=-6
x₂=(2+14)/2=8
b) Δ=(-7)²-4*(-3)*6=121
√Δ=11
x₁=(7-11)/(-6)=2/3
x₂=(7+11)/(-6)=-3
c) Δ=(5)²-4*(-3)*5=1
√Δ=1
x₁=(-5-1)/-4=-6/-4=3/2
x₂=(-5+1)/-4=1